build(deps): Bump mockall from 0.14.0 to 0.15.0

[dependabot]

Bumps mockall from 0.14.0 to 0.15.0.

Changelog

Sourced from mockall's changelog.

[ 0.15.0 ] - 2026-06-28

Added

• Compatibility with the #[auto_impl] macro. (#686)

Commits

• fc2c853 chore: Release
• 551fadd Merge pull request #688 from asomers/audit-job-lockfile
• 21529e3 Fix the audit CI job
• 2270cdb Merge pull request #686 from Kranzes/automock-auto_impl-compat
• d3b041d Add compatibility with the #[auto_impl] macro
• 055886e Merge pull request #687 from asomers/clippy-june-2026
• ed4bf07 Clippy cleanup
• f7a4d6f Merge pull request #685 from asomers/clippy=may-2026
• ba15180 Clippy cleanup: useless_borrows_in_formatting
• de22d57 Merge pull request #684 from asomers/github-workflows
• Additional commits viewable in compare view

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[github-actions]

canbench 🏋 (dir: canister) ea89ce0 2026-08-12 11:21:43 UTC

✅ canister/canbench_results.yml is up to date
📦 canbench_results_benchmark.csv available in artifacts

---------------------------------------------------

Summary:
  instructions:
    status:   No significant changes 👍
    counts:   [total 16 | regressed 0 | improved 0 | new 0 | unchanged 16]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min -4]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min -0.00%]

  heap_increase:
    status:   No significant changes 👍
    counts:   [total 16 | regressed 0 | improved 0 | new 0 | unchanged 16]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

  stable_memory_increase:
    status:   No significant changes 👍
    counts:   [total 16 | regressed 0 | improved 0 | new 0 | unchanged 16]
    change:   [max 0 | p75 0 | median 0 | p25 0 | min 0]
    change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

---------------------------------------------------
CSV results saved to canbench_results.csv